I heard of such cases many times. My friend was a victim of the same act. He is a hitch rider and one night when he rode a car on his way home,the driver (a non-resident citizen)initiated the "service" that he wanted from my friend by talking dirty and grabbing body part they have in common. My friend was shocked and jumped out of the car. He's fortunate that car was not running fast as the driver's other hand is not on the steering wheel. He suffered only minor scrathces and muscle pain. Tell your friend to take care of himself and avoid walking alone especially during late hours. Better to take the taxi as well. Even good people have wild desires that lead them to do something very bad to satisfy their thirst.